Tamm passed studentexamen at Lundsbergs boarding school in 1922 and received a Bachelor of Arts degree at Uppsala University in 1925 and a Candidate of Law in 1929.

[2] Tamm did his clerkship from 1929 to 1930 and studied at the Université des Hautes Etudes Internationales in Geneva from 1931 to 1932 and became an attaché at the Ministry for Foreign Affairs in Stockholm in 1932.

Tamm served in Helsinki in 1932, Chicago in 1934, Ankara in 1935 and at the Foreign Ministry in Stockholm in 1937.

He returned to Stockholm and the Foreign Ministry in 1966 and was then technical adviser at the Swedish UNESCO delegation in Paris from 1967 to 1971.

[2] Tamm died on 9 September 1990 in Paris and is buried with his wife at Löts Cemetery in Enköping Municipality.